#include "add.h"
#include "sub.h"
#include "div.h"
#include "mul.h"


int main()
{
    int x = 10;
    int y = 20;

    //printf("%d+%d=%d\n", x, y, add(x, y));
    printf("%d-%d=%d\n", x, y, sub(x, y));
    printf("%d*%d=%d\n", x, y, mul(x, y));

    return 0;
}
